#include <fcntl.h> #include <string.h> #include <sys/framebuffer.h> #include <sys/mman.h> int main() { int fd = open("/dev/fb0", O_RDWR); if (fd == -1) { perror("open"); return 1; } framebuffer_info_t fb_info; if (pread(fd, &fb_info, sizeof(fb_info), -1) == -1) { perror("read"); return 1; } size_t fb_size = fb_info.width * fb_info.height * BANAN_FB_BPP / 8; void* addr = mmap(nullptr, fb_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); if (addr == MAP_FAILED) { perror("mmap"); return 1; } memset(addr, 0xFF, fb_size); if (msync(addr, fb_size, MS_SYNC) == -1) { perror("msync"); return 1; } sleep(4); munmap(addr, fb_size); close(fd); return 0; }